<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>类继承</title>
</head>
<body>
    <script>
        // 手机
        function Phone (brand, price) {
            this.brand = brand;
            this.price = price;
        }
        Phone.prototype.call = function () {
            console.log(`我可以打电话！！！`);
        }

        // 智能手机
        function SmartPhone (brand, price, color, size) {
            Phone.call(this, brand, price);
            this.color = color;
            this.size = size;
        }

        // 设置子级构造函数的原型
        SmartPhone.prototype = new Phone;
        Phone.prototype.constructor = SmartPhone;

        // 声明子类的方法
        SmartPhone.prototype.photo = function () {
            console.log(`我可以拍照`);
        }

        SmartPhone.prototype.playGame = function () {
            console.log(`我可以玩游戏`);
        }

        let chuizi = new SmartPhone(`锤子`, 2499, `黑色`, `5.5inch`);
        console.log(chuizi);
    </script>
</body>
</html>